ATTACK ON IRAN WOULD ACCELERATE BOMB MAKING

"... If Iran is moving towards a nuclear weapons capacity it is doing so relatively slowly, most estimates put it at least five years away... an attack on Iranian nuclear facilities (now) "would almost certainly lead to a fast-track programme to develop a small number of nuclear devices as quickly as possible... a bit like deciding to build a car from spare parts instead of building the entire car factory..."
http://news.bbc.co.uk/2/hi/middle_east/6418049.stm